This is my recently made table saw miter sled. I had some 1/2" plywood scrap so I simply laminated them to three layers…mostly; the top layer was a little small because I miscalculated but it didn't matter. Then I cut it to a perfect 90 deg on the crosscut sled and screwed it onto my old table saw sled. I cut the corners off so that I could get larger boards on there and it works good so far. I do have to ensure that I cut the angles from both sides because its not perfectly set at 45 deg from the blade. I have a Ryobi table saw and the miter slot is a T-track so I had to cut the runners accordingly. They turned out much better than on my crosscut sled.